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PubMed2005

Illustrating sensitivity and uncertainty in environmental fate models using partitioning maps.

Variations of model predictions of the environmental fate of organic contaminants are usually analyzed for only one or at most a few selected chemicals, even though parameter sensitivity and contribution to uncertainty are widely different for different chemicals. A graphical method is introduced that allows for the comprehensive investigation of model sensitivity and uncertainty for all persistent organic nonelectrolytes at the same time. This is achieved by defining a two-dimensional hypothetical "chemical space" as a function of the equilibrium partition coefficients between air, water, and octanol (KOW, KAW, KOA), and plotting sensitivity and/or uncertainty of a specific model result to each input parameter as a function of this chemical space. The approach is illustrated for the bulk phase concentrations in air, water, soil, and sediment calculated by a level III model. Colored contour maps facilitate the identification of those input parameters that cause a high output variation of hypothetical and real chemicals. They also allow for the easy categorization of chemicals in terms of common parameter sensitivities, and thus comparable environmental behavior. Sensitivity varies with the mode of emission and the degradability of the chemicals, making it necessary to develop multiple sets of contour maps. Comparison of these sets of maps in turn allows the investigation of how parameter sensitivities change as a result of changes in mode of emission and persistence. The presented method can be used for investigating the sensitivity of any prediction obtained with any linear fate model that characterizes the partitioning behavior of organic chemicals with KAW, KoW, and KOA. Once the sensitivity maps have been constructed for a given environmental scenario, it is possible to perform a sensitivity analysis for a specific chemical by simple. placement of the substances' partitioning combinations within the chemical space. The maps can further contribute to the mechanistic understanding of a model's behavior, can aid in explaining observations of divergent environmental behavior of related substances, and can provide a rationale for grouping chemicals with similar model behavior, or for selecting representative example chemicals for a model investigation. They can also help in deciding when accurate and precise knowledge of physical chemical property data is crucial and when approximate numbers suffice to conduct a model investigation.

Air↗
PubMed2004

Maternal expressed emotion predicts children's antisocial behavior problems: using monozygotic-twin differences to identify environmental effects on behavioral development.

If maternal expressed emotion is an environmental risk factor for children's antisocial behavior problems, it should account for behavioral differences between siblings growing up in the same family even after genetic influences on children's behavior problems are taken into account. This hypothesis was tested in the Environmental Risk Longitudinal Twin Study with a nationally representative 1994-1995 birth cohort of twins. The authors interviewed the mothers of 565 five-year-old monozygotic (MZ) twin pairs and established which twin in each family received more negative emotional expression and which twin received more warmth. Within MZ pairs, the twin receiving more maternal negativity and less warmth had more antisocial behavior problems. Qualitative interviews were used to generate hypotheses about why mothers treat their children differently. The results suggest that maternal emotional attitudes toward children may play a causal role in the development of antisocial behavior and illustrate how genetically informative research can inform tests of socialization hypotheses.

Antisocial Personality Disorder↗
PubMedDate not supplied

Peacebuilders: a theoretically driven, school-based model for early violence prevention.

PeaceBuilders is a schoolwide violence-prevention program for elementary schools (K-5). A coalition of the Pima County Community Services Department, University of Arizona, and Heartsprings, Inc., (a Tucson-based company) are conducting a formal evaluation. Children who grow up to commit acts of violence show cognitive, social, and imitative differences from their peers. These characteristics can be ameliorated, most successfully through interventions that begin at an early age and involve multiple segments of the child's social experiences and interactions. PeaceBuilders activities are built into the school environment and the daily interactions among students, teachers, and administrative staff, all of whom are taught a common language and provided models of positive behavior, environmental cues to signal such behavior, opportunities to rehearse positive behavior, and rewards for practicing it. Four schools, one from each of four matched pairs, were randomly assigned to begin PeaceBuilders in Year 1. The remaining four schools begin in Year 2. Outcome assessments include student self-reports, standardized teacher reports, playground observations, and school and law enforcement records. Process assessments include school observations and surveys of teacher practices and satisfaction. Surveys were completed by 2,736 children. The sample is about 55% Hispanic, 26% Anglo, 14% Native American, and 4% African American. Among children in grades 3-5, during the past week 15% had been sent to the office for disciplinary problems, 13% tried to start a fight 27% hit someone, and 12% reported being threatened with a gun or knife. Violent behaviors and experiences are common among the studied children. A valid evaluation is underway of PeaceBuilders.

Age Factors↗
PubMed1999

The outcomes of an inpatient treatment program for geriatric patients with dementia and dysfunctional behaviors.

This study evaluated outcomes of an inpatient program designed to reduce severe agitated behavior in geriatric patients with dementia who could not be successfully treated on an outpatient basis. An individualized treatment plan was created for each patient (N = 250) that involved pharmacological and nonpharmacological interventions with behavioral, environmental, and psychological components. Assessment of behavioral, cognitive, and functional status was conducted for each patient on admission to the program and at discharge. Significant improvements on these assessments were observed. We conclude that the longitudinal, multidisciplinary approach used in this study was effective in significantly reducing intrusive and dangerous behaviors while preserving or enhancing patients' cognitive and functional abilities.

Aged↗
PubMed1997

Modeling the environmental fate of atrazine.

Mathematical simulation models of fate and transport of chemicals have been identified by researchers and regulators as potentially valuable tools for improving the understanding of the environmental behavior of chemicals which may be released to the environment as a consequence of routine (i.e., normal manufacturing, use, disposal) and non-routine (e.g., accidental spillage) events. In this context, CHEMFRANCE, a regional fugacity model level III, which calculates the environmental distribution of organic chemicals in 12 defined regions of France, or France as a whole, has been designed. The aim of this study is to show that CHEMFRANCE provides valuable simulation results for understanding the environmental fate behavior of atrazine.

Atrazine↗
PubMed2004

Relationship between androgens, environmental factors and reproductive behavior in male white rhinoceros (Ceratotherium simum simum).

We conducted a longitudinal study of the endocrine activity of free-range male white rhinos. An enzyme immunoassay to measure androgens in the feces was developed and validated to show that it can be used to study testicular activity. We identified two fecal metabolites similar to testosterone and dihydrotestosterone. Several lines of evidence suggest that these metabolites clearly reflect testicular activity. Firstly, the stimulation of testicular activity with synthetic GnRH caused a 156% increase in androgen metabolite concentrations in the feces 1 day after treatment. Secondly, androgen metabolite concentrations increased with sexual maturity in rhinos, and finally there was a correlation between testosterone concentrations in plasma and androgen metabolite concentrations in feces. Using the method that we developed, it was possible to establish whether a relationship exists between androgen metabolite concentrations, the behavior and environmental factors. Adult territorial males (n = 5) had elevated androgen metabolite concentrations during months of high rainfall (September-February) compared to months of little or no rainfall (March-August). The increase in concentrations coincided with the beginning of the rainy season, suggesting a seasonal trend in reproduction. This trend was confirmed by behavior observations showing both a higher frequency of conceptions within the first 4 months of increased androgen metabolite concentrations, and a higher number of inter-sexual conflicts, reflecting the initial aggression between the sexes during the consort period. It was also evident that males accompanying a receptive female had higher fecal androgen metabolite concentrations compared to being alone. The elevated levels were likely induced by female presence.

Aggression↗
PubMed2006

Circadian variation in swim performance.

Previous findings of time-of-day differences in athletic performance could be confounded by diurnal fluctuations in environmental and behavioral "masking" factors (e.g., sleep, ambient temperature, and energy intake). The purpose of this study was to examine whether there is a circadian rhythm in swim performance that is independent of these masking factors. Experienced swimmers (n = 25) were assessed for 50-55 consecutive hours in the laboratory. The swimmers followed a 3-h "ultra-short" sleep-wake cycle, involving 1 h of sleep in darkness and 2 h of wakefulness in dim light, that was repeated throughout the observation. The protocol distributes behavioral and environmental masking factors equally across the 24-h period. Each swimmer was scheduled to perform six maximal-effort 200-m swim trials that were distributed equally across eight times of day (n = 147 trials). Each trial was separated by 9 h. A cosine fit of intra-aural temperature data established the time of the lowest body temperature (Tmin). Swim performances were z-transformed and compared across the eight times of day and across twelve 2-h intervals relative to Tmin. Analysis of covariance, controlling for trial number, revealed a significant (P < 0.001) pattern in swim performance relative to environmental and circadian times of day. Performance peaked 5-7 h before Tmin (approximately 2300) and was worst from 1 h before to 1 h after Tmin (approximately 0500). Mean swim performance was 169.5 s; circadian variation from peak to worst performance was 5.8 s. These data suggest a circadian rhythm in athletic performance independent of environmental and behavioral masking effects.

Adult↗
PubMed2004

A perspective on the current strategies for the treatment of obesity.

The prevalence in obesity has increased dramatically over the past 30 years, more than double in the United States alone. Obesity is associated with an increased risk for type 2 diabetes mellitus, dyslipidemia, hypertension, biliary disease, obstructive sleep apnea, and certain types of cancer. The pathophysiology of obesity is complex, involving behavioral, environmental, and genetic factors. Current treatment options include behavior modification and lifestyle changes which incorporate weight-reducing diets and physical activity, FDA approved long-term anti-obesity pharmacological agents sibutramine and orlistat, non-FDA approved over-the-counter (OTC) supplements and nutriceuticals, and, when appropriate, bariatric surgery. Without adequate prevention and treatment of obesity, government agencies have suggested that the direct and indirect costs associated with obesity may overwhelm the healthcare system. This brief review explores the current data available on treatments for the obese patient including the relative merits of different types of macronutrient composition (e.g., low carbohydrate vs. high carbohydrate diets) of weight-reducing diets, the value of resistance/ strength training in physical activity programs designed for the obese patient, the safety and efficacy associated with OTC supplements and nutriceuticals for weight reduction (e.g., Ephedra, conjugated linoleic acid (CLA), Garcinia cambogia/ hydroxycitric acid (HCA), chromium, pyruvate), the safety and efficacy of FDA-approved long-term obesity treatments sibutramine and orlistat, and bariatric surgery.

Anti-Obesity Agents↗
PubMed1988

Environmental interventions to promote healthy eating: a review of models, programs, and evidence.

Environmental interventions are an important part of efforts to improve health in populations. With respect to strategies to encourage positive nutrition behavior, environmental approaches help create opportunities for action by removing barriers to following a healthy diet. This article reviews the rationale, conceptual models, program examples, and recent empirical evidence regarding the extent and effects of environmental interventions to promote healthy eating. The state of the art is described for five types of interventions: (1) changes in the food supply; (2) point of choice nutrition information; (3) collaboration with private sector food vendors; (4) worksite nutrition policies and incentives; and (5) changes in the structure of health and medical care related to nutrition. Environmental approaches to dietary behavior change can reach large segments of the population through increased availability of nutritious foods, provision of quality nutrition services in workplace and health care settings, and accessible information about healthful food choices. Nutrition intervention can also serve as a model for other types of health promotion initiatives using multidimensional environmental and educational technologies.

Food Supply↗
PubMed2003

Environmental correlates to behavioral health outcomes in Alzheimer's special care units.

PURPOSE: We systematically measured the associations between environmental design features of nursing home special care units and the incidence of aggression, agitation, social withdrawal, depression, and psychotic problems among persons living there who have Alzheimer's disease or a related disorder. DESIGN AND METHODS: We developed and tested a model of critical health-related environmental design features in settings for people with Alzheimer's disease. We used hierarchical linear modeling statistical techniques to assess associations between seven environmental design features and behavioral health measures for 427 residents in 15 special care units. Behavioral health measures included the Cohen-Mansfield physical agitation, verbal agitation, and aggressive behavior scales, the Multidimensional Observation Scale for Elderly Subjects depression and social withdrawal scales, and BEHAVE-AD (psychotic symptom list) misidentification and paranoid delusions scales. Statistical controls were included for the influence of, among others, cognitive status, need for assistance with activities of daily living, prescription drug use, amount of Alzheimer's staff training, and staff-to-resident ratio. Although hierarchical linear modeling minimizes the risk of Type II-false positive-error, this exploratory study also pays special attention to avoiding Type I error-the failure to recognize possible relationships between behavioral health characteristics and independent variables. RESULTS: We found associations between each behavioral health measure and particular environmental design features, as well as between behavioral health measures and both resident and nonenvironmental facility variables. IMPLICATIONS: This research demonstrates the potential that environment has for contributing to the improvement of Alzheimer's symptoms. A balanced combination of pharmacologic, behavioral, and environmental approaches is likely to be most effective in improving the health, behavior, and quality of life of people with Alzheimer's disease.

Aged↗
PubMed1981

Predicting adaptive functioning among mentally ill persons in community settings.

Attempts to improve instrumental role performance among mentally ill persons have traditionally focused on the modification of individual level variables. Recent interest in environmental-behavioral linkages, however, has led to attempt to isolate environmental variables which are both readily manipulable and significantly related to improved instrumental role performance. The present study examines the impact of a variety of individual, residential, and community variables on instrumental role performance using multiple regression analysis. The 10 variables in the equation had a multiple r of .77 with total score on the Residential portion of the Adaptive Functioning Index, indicating that they account for 60% of the variance in scores. Individual level variables account for 3% of the variance, while environmental variables, primarily those related to normalization account for 57% of the variance. The data suggest that environmental normalization may be an effective technology as well as an ideology.

Adaptation, Psychological↗
PubMed2005

Familial resemblance in eating behaviors in men and women from the Quebec Family Study.

OBJECTIVE: It is commonly recognized that genetic, environmental, behavioral, and social factors are involved in the development of obesity. The family environment may play a key role in shaping children's eating behaviors. The purpose of this study was to estimate the degree of familial resemblance in eating behavioral traits (cognitive dietary restraint, disinhibition, and susceptibility to hunger). RESEARCH METHODS AND PROCEDURES: Eating behavioral traits were assessed with the Three-Factor Eating Questionnaire in 282 men and 402 women (202 families) from the Quebec Family Study. Familial resemblance for each trait (adjusted for age, sex, and BMI) was investigated using a familial correlation model. RESULTS: The pattern of familial correlation showed significant spouse correlation for the three eating behavior phenotypes, as well as significant parent-offspring and sibling correlations for disinhibition and susceptibility to hunger. According to the most parsimonious model, generalized heritability estimates (including genetic and shared familial environmental effects) reached 6%, 18%, and 28% for cognitive dietary restraint, disinhibition, and susceptibility to hunger, respectively. DISCUSSION: These results suggest that there is a significant familial component to eating behavioral traits but that the additive genetic component appears to be small, with generalized heritability estimates ranging from 6% to 28%. Thus, non-familial environmental factors and gene-gene and gene-environmental interactions seem to be the major determinants of the eating/behavioral traits.

Adolescent↗
PubMed1998

Ascaris lumbricoides intensity in relation to environmental, socioeconomic, and behavioral determinants of exposure to infection in children from southeast Madagascar.

Ascaris lumbricoides worm counts were examined as the outcome products of exposure proxy variables. A survey of 663 children, 4-10 yr old, living in southeastern Madagascar revealed prevalences of 93% for A. lumbricoides, 55% for Trichuris trichiura, and 27% for hookworm. Worm expulsions were conducted on 428 of these children; the data revealed an overdispersed distribution of A. lumbricoides, with an arithmetic mean of 19.2 worms per child. A concurrent socioeconomic household survey was conducted by visitation and interview. Exposure to infection was assessed by environmental, demographic, behavioral, and socioeconomic indicators. Ascaris lumbricoides aggregations were associated with gender, housing style, ethnicity, and agricultural factors. The results suggest that exposure and infection are ubiquitous in this child population, and that A. lumbricoides intensity is influenced by gender-related behavioral and environmental factors that contribute to exposure.

Animals↗
PubMed1990

Ending smoking at the Johns Hopkins Medical Institutions. An evaluation of smoking prevalence and indoor air pollution.

An empiric evaluation of a policy ending smoking in a large urban medical center was conducted. The study included a prospective cohort tracking of employees to measure changes in smoking behavior, environmental fires, smoking-related litter, and environmental tobacco pollution exposure. A 25% decrease in employee smoking prevalence was found (21.7% vs 16.2% before vs after policy implementation, respectively). The daily number of cigarettes reportedly smoked by employees who continued smoking and the total number smoked at work decreased across all occupational categories by an average of 25%. Significant reductions were noted in the level of public smoking and the amount of cigarette remnants. Nicotine vapor concentrations decreased significantly in all areas except restrooms. These findings suggest that visible smoking and environmental tobacco smoke exposure can be markedly decreased by instituting a policy eliminating smoking in a large medical center.

Air Pollutants, Occupational↗
PubMed1991

Etiology of drinking and driving among adolescents: implications for primary prevention.

A prospective study was conducted to investigate what factors are predictive of self-reported drinking and driving (DD) among adolescents. The study employs a theoretical framework taken from Problem Behavior Theory; environmental, personality, and behavioral factors are explored for their predictability of DD. A cohort of 1482 high school students completed a written survey in spring of 1986 and again in fall of 1986. The findings confirm that Problem Behavior Theory provides a useful theoretical framework with which to identify etiological factors predictive of DD among adolescents. Identified personality, perceived environmental, behavioral, and demographic factors accounted for approximately 50% of the reported variance in DD at baseline. The same factors accounted for approximately 40% percent of the variance in follow-up DD and were predictive both among the students who did not drink and drive at baseline (incidence cases), and among those students who did drink and drive at baseline (continuation versus discontinuation of the behavior). Based on these etiological data, we recommend that school-based, peer-led educational prevention programs be designed to reach young adolescents prior to the age at which a driver's license is obtained. We further recommend that the programs be broad-based and consider DD within the larger context of drinking and driving related behaviors and traffic safety in general.

Adolescent↗
PubMed2002

Behavioral and psychopharmacological treatment of the paraphilic and hypersexual disorders.

In this article, the second of a two-part series, the authors present information on the clinical assessment of individuals with paraphilias and hypersexual disorders. They review ethical considerations in the assessment and treatment of individuals with paraphilias. The role of interview and subjective and objective instruments in the assessment of individuals with paraphilias and hypersexual disorders is discussed. The authors discuss the use of penile plethysmography or phallometry, polygraphy, and viewing time assessments. Risk assessment of sexual offenders is reviewed. The authors then discuss behavioral, environmental, and psychopharmacological treatments for paraphilias and hypersexual disorders. Cognitive-behavioral therapy appears to be the most effective nonpharmacological strategy. The authors describe cognitive-behavioral techniques for decreasing and/or controlling sexual urges (e.g., satiation, covert sensitization, fading, cognitive restructuring, victim empathy therapy) as well as methods for enhancing appropriate sexual interest and arousal (e.g., social skills training, assertiveness skills training, sex education, couples therapy). The authors also discuss the role of relapse prevention therapy and 12-step programs, as well as other nonbiological therapies such as surveillance networks. The importance of providing appropriate treatment for comorbid conditions (e.g., depression, substance abuse or dependence) is stressed. The authors then review psychopharmacological treatments, including serotonin reuptake inhibitors (SRIs) and antiandrogens, in particular, the use of gonadotropin-releasing hormone (GNRH) agonists. SRIs have been studied in these disorders in an uncontrolled way and appear promising. Earlier antiandrogens (e.g., estrogen, progesterone, and cyproterone acetate) have demonstrated efficacy in the treatment of paraphilias. The newer GNRH agonists have the advantage over the earlier treatments of being available in long-acting depot formulations and having fewer side effects. Preliminary studies and case reports with these agents appear promising. Further study of both the SRIs and GNRH agonists in these disorders is needed. The article concludes with a treatment algorithm, in which the authors suggest beginning with less restrictive treatments (e.g., behavioral or verbal therapies), if possible, and moving to more restrictive alternatives (e.g., biological therapies, institutionalization) as needed. A guide for clinicians and patients about where and how to find appropriate clinicians and treatment resources in the United States is provided.

Journal Article↗
PubMed2000

Modulation of morphine sensitization in the rat by contextual stimuli.

RATIONALE: The repeated administration of addictive drugs, such as amphetamine, cocaine, and morphine, produces a progressive enhancement (sensitization) of their psychomotor activating effects. We have previously shown that administration of amphetamine or cocaine in a distinct test environment promotes more robust psychomotor sensitization than if they are given at home. No information is available, however, on whether this environmental manipulation has a similar effect on sensitization to morphine, a drug that enhances dopamine (DA) release in the striatum indirectly by disinhibiting midbrain DA neurons. OBJECTIVES: The main goal of present study was to determine whether exposure to a distinct environmental context facilitates morphine sensitization. METHODS: As an index of psychomotor activation, we used rotational behavior in rats with a unilateral 6-hydroxydopamine lesion of the mesostriatal DA system. There are inconsistencies in the literature regarding the ability of morphine to elicit rotational behavior. Therefore, in experiment 1 we determined the effect of 2.0, 3.0, 4.0, 6.0, and 8.0 mg/kg, IP, of morphine on rotational behavior. In experiment 2, we studied the effect of five consecutive IV infusions of saline or morphine (2.0 mg/kg) in rats treated either in their home cage or in a distinct and relatively novel test environment. After 5 days of withdrawal, all rats received an IV infusion of 2.0 mg/kg morphine (Morphine challenge). The following day all rats received an IV infusion of saline (Saline challenge). RESULTS: Morphine produced a dose-dependent increase in rotational behavior. Environmental novelty enhanced both the acute psychomotor response to morphine and its ability to induce psychomotor sensitization. Furthermore, a conditioned rotational response was seen only in animals treated in the novel environment. CONCLUSIONS: Environmental novelty can facilitate the development of sensitization to the psychomotor activating effects of major addictive drugs, such as amphetamine, cocaine, and morphine.

Analgesics, Opioid↗